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drm/dp: Add POST_LT_ADJ_REQ helpers

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Add small helpers (drm_dp_post_lt_adj_req_supported() and
drm_dp_post_lt_adj_req_in_progress()) to help with implementing
the POST_LT_ADJ_REQ sequence.

Tested-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250718120154.15492-3-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2025-07-18 15:01:52 +03:00
parent 2b8e4b94c1
commit 3a9cf30179
2 changed files with 16 additions and 0 deletions
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8
drivers/gpu/drm/display/drm_dp_helper.c
View File

@ -123,6 +123,14 @@ bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
}
EXPORT_SYMBOL(drm_dp_clock_recovery_ok);
bool drm_dp_post_lt_adj_req_in_progress(const u8 link_status[DP_LINK_STATUS_SIZE])
{
u8 lane_align = dp_link_status(link_status, DP_LANE_ALIGN_STATUS_UPDATED);
return lane_align & DP_POST_LT_ADJ_REQ_IN_PROGRESS;
}
EXPORT_SYMBOL(drm_dp_post_lt_adj_req_in_progress);
u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE],
int lane)
{

8
include/drm/display/drm_dp_helper.h
View File

@ -37,6 +37,7 @@ bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
int lane_count);
bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
int lane_count);
bool drm_dp_post_lt_adj_req_in_progress(const u8 link_status[DP_LINK_STATUS_SIZE]);
u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE],
int lane);
u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SIZE],
@ -155,6 +156,13 @@ drm_dp_enhanced_frame_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
(dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP);
}
static inline bool
drm_dp_post_lt_adj_req_supported(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{
return dpcd[DP_DPCD_REV] >= 0x13 &&
(dpcd[DP_MAX_LANE_COUNT] & DP_POST_LT_ADJ_REQ_SUPPORTED);
}
static inline bool
drm_dp_fast_training_cap(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
{